JP3769482B2 - Vacuum microwave thawing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vacuum microwave thawing machine that irradiates microwaves in a reduced pressure state to heat and thaw an object to be thawed such as frozen food.
[0002]
[Prior art]
The chamber in the conventional vacuum microwave thawing machine is a box using a stainless steel plate or an iron plate, and the plate thickness is increased or a reinforcing rib is provided to withstand the atmospheric pressure that acts when the inside is decompressed. And increased strength. Similarly, the chamber door is also manufactured using a thick stainless steel plate or iron plate as in the chamber.
[0003]
[Problems to be solved by the invention]
By the way, in the conventional vacuum microwave thawing machine, since the door is made of a thick stainless steel plate or iron plate, the door itself is heavy and heavy when opening and closing, and it cannot be said that the operability is good. Moreover, since the stainless steel plate and the iron plate have a large electric resistance on the surface, a wall loss of microwaves is generated, which is a cause of reducing the heating efficiency.
In addition, regarding the seal between the door and the chamber, if an airtight seal material and an electromagnetic wave seal material are provided, the electromagnetic wave seal material inhibits the adhesion of the airtight seal material. It was difficult to achieve both functions.
[0004]
Therefore, in view of the circumstances described above, the present invention provides a vacuum microwave thawing machine that can easily secure the rigidity of a door, that is light in weight, has good operability, and can improve the efficiency of thawing work. For the purpose.
[0005]
[Means for Solving the Problems]
The present invention has been proposed in view of the above, and according to the first aspect of the present invention, there is provided a chamber having a door, a vacuum pump for depressurizing a storage chamber defined by the chamber and the door, and a micro pump into the storage chamber. A vacuum micro that is equipped with a microwave generator for irradiating a wave and a turntable provided in the chamber, and irradiates the microwave in a state where the storage chamber is decompressed to heat the object to be thawed on the turntable to defrost. In the wave decompressor
A vacuum microwave thawing machine characterized in that the door is integrally formed of aluminum and the surface on the storage chamber side is a concave curved surface.
[0006]
According to a second aspect of the present invention, there is provided the vacuum microwave defroster according to the first aspect, wherein the concave curved surface is mirror-finished and an insulating film is formed.
[0007]
3. The vacuum microwave defroster according to claim 2, wherein the concave curved surface has a curvature that reflects the microwave toward the object to be thawed on the turntable. .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing the appearance of the vacuum microwave defroster of the present embodiment. FIG. 2 is a cross-sectional view of the chamber.
[0012]
As shown in FIG. 1, the housing 2 of the vacuum microwave thawing machine 1 according to the present embodiment is configured as a bowl-shaped device, and a food storage unit 3 for storing an object to be thawed such as frozen food is disposed on the top. In addition, a machine storage unit 4 for storing a drive motor, a vacuum mump, and the like, which will be described later, is disposed at the lower part, and a control unit 5 for storing a control device is provided at the uppermost part. The panel is provided with a display unit 6 for displaying the weight of the object to be thawed, the thawing time, and the like, and an operation unit 7 for inputting power on / off and various setting values. In addition, a caster 8 for facilitating the movement of the thawer 1 is provided on the lower surface of the casing 2 of the vacuum microwave thawer 1.
[0013]
As shown in FIGS. 1 and 2, the main body of the food container 3 in the vacuum microwave thawing machine 1 of the present embodiment is constituted by a hollow box-shaped chamber 10 having an opening on the front surface, and the chamber 10 is an electromagnetic wave. It is formed as a metal pressure-proof and airtight container having an inner wall structure capable of blocking. A door 11 capable of closing the inside of the chamber 10 in a sealed state is attached to the front opening of the chamber 10 so as to be openable and closable, for example, with the front right end as a hinge portion. On the left side of the front surface, a handle 12 is attached to be held during the opening / closing operation, and the chamber 10 and the door 11 define the storage chamber 9. The flange 10 'of the chamber 10 facing the back surface of the door 11 is equipped with an electromagnetic wave sealing material made of a metal net for preventing electromagnetic waves from leaking to the outside and an airtight sealing material for maintaining airtightness. . The door 11 and both sealing materials will be described in detail later.
[0014]
At the bottom of the chamber 10, a rotating shaft 13 is rotatably supported in a state of being supported by a bearing 14, and an object to be thawed is placed on the upper end of the rotating shaft 13 facing the chamber. A turntable 15 that is placed and rotated together with the rotary shaft 13 is detachably attached, and a table drive motor 16 is connected to a base end portion of the rotary shaft 13 via a speed reduction mechanism.
[0015]
The central portion of the back surface of the chamber 10 is placed on the turntable 15 by irradiating microwaves into the chamber via a straight waveguide 20 and a reducer waveguide 21 communicating with the chamber 10. The microwave generator 22 for heating the to-be-thawed material is connected. In this embodiment, a magnetron is employed as the microwave generator 22, and a pressure partition made of a glass plate that easily transmits microwaves to the flange connection portion 23 between the straight waveguide 20 and the reducer waveguide 21. Is installed.
[0016]
A discharge detection sensor 30 is provided on the back surface of the chamber 10 to detect when a discharge occurs in the chamber 10 due to microwave irradiation. A UV sensor that is determined by detecting (UV) is employed. Further, a vacuum pressure sensor 31 for detecting the pressure in the chamber 10 is provided on the upper portion of the chamber 10.
[0017]
An upper part of the chamber 10 is provided with an air release valve 40 for releasing the internal pressure to the atmosphere, and a pressure adjusting valve 41 for adjusting the pressure in the chamber, and a pressure reducing valve for reducing the pressure inside the chamber 10. A vacuum pump 46 driven by a pump drive motor 45 is connected to the decompression system 43 via a check valve 44, and the pump drive motor 45 and the vacuum pump 46 are connected to the above-mentioned machine storage section. 4 is accommodated.
[0018]
The air release valve 40 and the pressure regulating valve 41 are constituted by, for example, electromagnetic valves in order to enable opening / closing control by a control device housed in the control unit 5. The pressure regulating valve 41 may be provided in the middle of the pressure reducing system 43, for example, between the chamber 10 and the check valve 44, so that oxygen does not easily enter the chamber 10 in the pressure-reducing step.
[0019]
The door 11 is a rectangular door integrally formed of aluminum, and has a concave curved surface 17 on the surface of the storage chamber 9 as shown in FIG. Therefore, even if the weight is reduced, it is easy to obtain the required strength, and it is possible to ensure high rigidity, particularly with respect to the atmospheric pressure acting in a reduced pressure state.
[0020]
The concave curved surface 17 of the door 11 is mirror-finished and has an insulating film formed on the surface by anodizing or the like. Therefore, the reflection efficiency of the microwave is good and the heating of the wall surface by the microwave can be prevented. When an insulating film such as alumite is formed, mechanical scratches and the like can be prevented, and discharge due to microwaves generated in a portion in contact with the chamber 10 can be prevented. Moreover, if the metal covering the outer periphery of the electromagnetic wave sealing material is made of the same material as the chamber, electrolytic corrosion can be prevented.
[0021]
Further, the curvature of the concave curved surface 17 is set to a curvature at which the microwave is reflected toward the turntable. As this curvature, for example, a curvature according to a curved line having a focus such as a parabola or a hyperbola is adopted. Therefore, coupled with the mirror finish, the microwaves can be efficiently reflected and absorbed by the object to be thawed on the turntable, so that more efficient thawing can be achieved.
[0022]
As described above, the airtight sealing material 24 and the electromagnetic wave sealing material 25 are provided on the outer surface of the front opening of the chamber 10, specifically, on the front surface of the flange portion 10 ′ formed in the front opening so Maintains airtightness and prevents microwave leakage. In the present embodiment, the first groove 26 is formed in a substantially square shape on the front surface of the flange portion 10 ′, and the second grooves 27 are formed at equal intervals outside the first groove 26, that is, the first and second grooves 27 are parallel to each other. The airtight sealing material 24 as the first sealing material is fitted in the inner first groove 26, and the electromagnetic wave sealing material 25 as the second sealing material is fitted in the outer second groove 27, respectively. 25 is slightly protruded from the front surface of the flange portion 10 '.
[0023]
The hermetic seal material 24 is a solid string-like seal material made of resin, and the one shown in FIG. 3 is a synthetic resin solid seal with a circular cross section, which is lipped to two locations with a phase difference of about 90 degrees from the center. 24 'protrudes in a letter C shape and is integrally molded. When the hermetic seal material 24 is fitted into the first groove 26, as shown in FIG. 3A, both lips 24 'protrude from the inner surface of the door and are one part of the main body having a circular cross section. The portion is also slightly protruded from the flange portion 10 '.
[0024]
On the other hand, the electromagnetic wave sealing material 25 is a hollow elastic string-like sealing material whose outer peripheral surface is covered with a metal wire (for example, a metal net material made of the same material as the chamber), and the one shown in FIG. The surface is covered with a metal mesh. And when this electromagnetic wave sealing material 25 is fitted in the 2nd groove | channel 27, as shown to Fig.3 (a), it attaches in the state which a part of metal mesh and a round pipe protrude slightly from a door inner surface. . Further, the electromagnetic wave sealing material 25 has a protruding length from the front surface of the flange portion 10 so as to come into contact with the inner surface of the door 11 slightly later than the airtight sealing material 24 when the door 11 is closed. It is attached a little less than. That is, the protruding length of the airtight sealing material 24 is set longer than the protruding length of the electromagnetic wave sealing material 25.
[0025]
Therefore, when the door 11 is closed, as shown in FIG. 3B, first, the leading edge of the lip 24 'of the airtight seal material 24 comes into contact with the back surface of the door 11, and both lips 24' are opened in a C shape. Then, the arcuate protruding edge of the electromagnetic wave sealing material 25 comes into contact with the back surface of the door 11.
[0026]
When the pressure inside the chamber 10, that is, the inside of the storage chamber 9 is reduced by the vacuum pump 46 in this state, the door 11 is pressed toward the chamber 10 by the atmospheric pressure, and the gap between the door 11 and the chamber 10 is narrowed by this pressing force. . Therefore, as shown in FIG. 3C, the electromagnetic wave sealing material 25 is crushed into a substantially elliptical shape and brought into surface contact with the back surface of the door 11, thereby enhancing the sealing effect of the electromagnetic wave sealing material 25. Further, since the hermetic seal member 24 is also pressed against the door 11, the lip 24 ′ opens further and comes into strong contact, and the circular cross-section portion strongly adheres to the back surface of the door 11. Therefore, the sealing function of the hermetic seal material 24 is enhanced and leakage can be prevented.
[0027]
Since the vacuum pump 46 continues to depressurize the chamber 10, when the degree of vacuum in the storage chamber 9 increases, the atmospheric pressure acting on the door 11 is increased accordingly. When this pressing force increases, the electromagnetic wave sealing material 25 has a low degree of elastic repulsion and is easily crushed. Compared to this, the airtight sealing material 24 has a high degree of elastic repulsion and is not easily crushed. When the action increases, most of the action acts as a force for crushing the hermetic seal material 24. Therefore, the hermetic seal material 24 is closely attached regardless of the presence of the electromagnetic wave seal material 25 as the pressure in the chamber 10 decreases, thereby further strongly adhering to improve the sealing performance and preventing leakage. To do. For this reason, the pressure reduction process by the vacuum pump 46 can be performed efficiently.
[0028]
When the pressure in the chamber 10 is reduced to a predetermined degree of vacuum, the microwave generator 22 is activated to irradiate the microwave. As described above, since the inner surface of the door 11 is formed in a mirror surface, The microwave reflected by the 11 concave curved surfaces 17 can be efficiently heated toward the object to be thawed on the turntable 15.
[0029]
Next, a control unit that controls the vacuum pump 46, the microwave generator 22, and the like will be described.
[0030]
FIG. 4 is a block diagram showing a control system in the vacuum microwave defroster of the present embodiment. The control device 50 housed in the control unit 5 is configured by, for example, a microcomputer that executes a control program recorded in the ROM 51, and the control device 50 includes a table drive motor 16 that rotationally drives the turntable 15. A power control system 52, a power control system 53 of a pump drive motor 45 that drives the vacuum pump 46, an open / close control system 54 of the atmospheric release valve 40, an open / close control system 55 of the pressure regulating valve 41, and the microwave A power supply control system 56 of the generator 22, a detection value input system 57 of the discharge detection sensor 30, a detection value input system 58 of the vacuum pressure sensor 31, an input system 59 such as a set value of the operation unit 7, A display output system 60 of the display unit 6 is connected, and the control device 50 controls the set values of the operation unit 7, the discharge detection sensor 30, and the vacuum pressure sensor. Based on the detected values or the like of the server 31 controls to drive the respective devices such as the pump drive motor 45 and the microwave generator 22 in accordance with a control program recorded in the ROM.
[0031]
Next, the vacuum microwave thawing method of the present embodiment performed using the vacuum microwave thawing machine 1 as described above will be described. FIG. 5 is an explanatory diagram showing a thawing cycle in the vacuum microwave thawing machine 1 of the present embodiment.
[0032]
As shown in FIG. 5, the vacuum microwave thawing machine 1 according to this embodiment irradiates microwaves M and M while repeatedly performing the decompression steps G, G ′, G ″... And the decompression steps F, F ′. It is a device for heating and thawing the object to be thawed, and the vacuum pump 46 continues to operate during the decompression process as well as the decompression process.
[0033]
As a preparation stage for thawing, first, the front door 11 is opened and an object to be thawed such as frozen food is placed on the turntable 15, and the door 11 is closed again to be in a sealed state. Contains the thaw. Note that the atmosphere release valve 40 and the pressure regulating valve 41 are closed.
[0034]
Next, the pump drive motor 45 is driven to operate the vacuum pump 46, and pressure reduction in the chamber 10 is started via the pressure reduction system 43. Then, the pressure reduction degree gradually decreases from 101.3 kPa (760 Torr) of the atmospheric pressure through the point A, and the pressure reduction step G is performed to the pressure reduction equilibrium region B. In this pressure reduction step G, the material to be thawed is pre-dried. .
[0035]
Here, the decompression equilibrium region is a region in which the degree of decompression with respect to a certain time is extremely reduced. For example, the degree of decompression (ΔP) in 30 seconds (Δt) is ΔP / Δt <13.3 Pa (0.1 Torr). Although it is sometimes grasped that the decompression equilibrium region has been reached, the equilibrium pressure in the decompression equilibrium region rises and falls due to the saturated vapor pressure in the chamber. Note that whether or not the decompression equilibrium region has been reached is determined by the control device based on the pressure signal from the vacuum pressure sensor 31.
[0036]
After performing the decompression step G to the decompression equilibrium region B, the pressure regulating valve 41 is opened at a predetermined opening degree to be described later, and the process proceeds to the decompression step F. The degree of decompression in the decompression step F causes vacuum discharge. The microwave irradiation M by the magnetron 22 is started and set in advance at the point C after exceeding the lower limit P1 [set to 1.33 kPa (10 Torr) with some margin in this embodiment] When the pressure is restored to the return pressure upper limit value D, the control device closes the pressure regulating valve 41 based on the pressure signal from the vacuum pressure sensor, and then proceeds to the pressure reducing step G ′ again. Then, the object to be thawed is heated by continuing the microwave irradiation M by the magnetron 22 up to the point A ′ before reaching the lower limit P1 at which the degree of decompression does not cause vacuum discharge. Stop irradiation.
[0037]
In the present embodiment, the lower limit P1 of the degree of decompression that does not cause vacuum discharge is set to 1.33 kPa (10 Torr) as described above. That is, at the point C after the degree of decompression in the decompression step F exceeds 1.33 kPa (10 Torr), the microwave irradiation M by the magnetron 22 is started and the decompression is restored to the preset decompression upper limit D. Then, the process proceeds to the decompression step G ′ again, and the object to be thawed is heated by continuing the microwave irradiation M by the magnetron to the point A ′ just before the degree of decompression reaches 1.33 kPa (10 Torr). As described above, since the microwave irradiation M is performed from the middle of the decompression process F to the decompression process G ′, one thawing cycle including the decompression process and the decompression process is performed as compared with the conventional case where irradiation is performed only in the decompression process. A sufficient irradiation time can be secured.
[0038]
The return pressure upper limit value D is a variable pressure value set by the output of the magnetron 22 that irradiates microwaves, the pressure reduction capability of the vacuum pump 46, and the volume of the chamber 10, and in this embodiment, the throttle of the pressure regulating valve 41 By adjusting the throttle of the valve 41 ′, it is set to 6.66 kPa (50 Torr). Therefore, when the pressure is restored to 6.66 kPa (50 Torr), the leak from the pressure regulating valve 41 and the suction capacity of the vacuum pump 46 balance, and the pressure rises while maintaining the pressure regulating valve 41 at 6.66 kPa (50 Torr). I do not.
[0039]
In the present embodiment, the pressure value of the decompression upper limit D is appropriately set in accordance with the output of the magnetron 22 that irradiates the microwave, the decompression capability of the vacuum pump 46, and the volume of the chamber 10, so that the vacuum discharge The microwave irradiation time without excess or deficiency can be taken before entering the generation area, and the pressure can be reduced efficiently.
[0040]
In this embodiment, as a means for detecting that the return pressure upper limit value D has been reached, it is detected by a signal from the vacuum pressure sensor 31 so that the control device closes the pressure regulating valve 43 and proceeds to the pressure reducing process. Although configured, the present invention is not limited to this, and may be stopped by timer control.
[0041]
After the microwave irradiation is stopped, the object to be thawed is sublimated and cooled in the decompression process from the point A ′ to the decompression equilibrium region B ′. In this way, after the object to be thawed is heated by irradiating the microwave to the point A ′ in the decompression step G ′, the object to be thawed is sublimated and cooled in the decompression process from the point A ′ to the decompression equilibrium region B ′. When the object to be thawed is heated by irradiating with microwaves, the temperature of the surface part of the object to be thawed becomes higher than the temperature of the center part, and if heating is continued as it is, there will be inconveniences such as drip on the surface part. This is because the surface portion is cooled by sublimation to reduce the temperature difference between the inside and outside.
[0042]
That is, when sublimation starts, the latent heat of vaporization is deprived and the temperature of the surface portion decreases, and the heat of the surface portion moves (heat conduction) to raise the temperature of the central portion. As a result, the temperature of the material to be thawed is made uniform, and the temperature of the material to be thawed rises as a whole, and thawing is promoted. In addition, the thawing of the material to be thawed is promoted as a whole while the temperature of the material to be thawed is made uniform, so that thawing partially proceeds and drip is generated or microwaves concentrate on this drip. Can be prevented.
[0043]
In the present embodiment, the process proceeds to the decompression step F, and the microwave is generated at the point C after the decompression degree of the decompression step F exceeds the lower limit P1 of 1.33 kPa (10 Torr) that does not cause vacuum discharge. Irradiation M is started, and after returning to 6.66 kPa (50 Torr) which is a preset decompression upper limit D, the process proceeds to the decompression step G ′ again, and the degree of decompression is the lower limit P1 at which no vacuum discharge occurs. A thawing cycle in which microwave irradiation M is continuously heated to a point before A 'reaches 1.33 kPa (10 Torr), and after the microwave irradiation M is stopped, sublimation cooling is performed in the decompression process to the decompression equilibrium region B ′. Is repeated as one cycle.
[0044]
That is, in FIG. 5, after performing the decompression step G ′ to the decompression equilibrium region B ′, the process proceeds to the decompression step F ′, and the decompression degree of the decompression step F ′ is the lower limit value P1 at which no vacuum discharge occurs. At the point C ′ after exceeding 33 kPa (10 Torr), the microwave irradiation M ′ is started again, and after returning to 6.66 kPa (50 Torr) which is a preset decompression upper limit D ′, the pressure is reduced again. The process proceeds to step G ″, and the microwave irradiation M ′ is continuously heated until the pressure reaches 1.33 kPa (10 Torr) of A ″ which is the lower limit P1 at which the degree of decompression does not cause vacuum discharge. After the irradiation is stopped again, a defrosting cycle for sublimation cooling in the decompression process up to the decompression equilibrium region B ″ is performed as the second cycle. The decompression characteristics in each decompression process F, F ′. 41 'installation Because it depends on, constant in each thawing cycle, i.e., the curve of the condensate pressure curve is constant in each thawing cycle, which makes it possible to perform stable thawed.
[0045]
As shown in FIG. 5, when such a thawing cycle is repeated, the saturated vapor pressure in the chamber 10 increases as the temperature of the material to be thawed rises, so that the decompression equilibrium regions B, B ′, B ″. The depressurization degree of the above shows a phenomenon of increasing sequentially as the thawing cycle is repeated. Therefore, when the depressurization degree in the depressurization equilibrium regions B, B ′, B ″. That is, the desired thawing temperature can be set by setting the saturated vapor pressure region, and when the decompression equilibrium is reached in this setting region, the thawing operation is terminated assuming that the desired thawing temperature has been reached. The number of repetitions of the thawing cycle until the set region is reached also depends on the mass of the material to be thawed, the output of the magnetron 22, the decompression capacity of the vacuum pump 46, and the like. In the present embodiment, P2A in FIG. When the pressure value is 480 Pa (3.6 Torr), the pressure value of P2B is 453 Pa (3.4 Torr), and the degree of pressure reduction in the pressure reduction equilibrium region B, B ′, B ″... Reaches a value between P2A and P2B Then, assuming that the temperature of the object to be thawed has reached about −3 ° C., the thawing cycle is completed.
[0046]
When the controller 50 determines the end of the thawing cycle, the air release valve 40 is opened, the power source of the pump drive motor 45 is shut off, the vacuum pump 46 is stopped, and the inside of the storage chamber 9 returns to atmospheric pressure. The door 11 can be opened, and the material to be thawed that has been thawed to about −3 ° C. can be taken out from the chamber 10.
[0047]
When a discharge phenomenon occurs in the chamber 10 for some reason, the discharge detection sensor 30 detects this by the generation of UV, and the control device 50 forces the magnetron 22 through the power supply control system 56. Thus, the inner wall of the chamber 10 is prevented from being damaged.
[0048]
In each of the above embodiments, the material to be thawed has been described as a frozen food. However, the material to be thawed in the present invention is not limited to food, and blood, serum, semen, medicine, and the like may be used.
[0049]
In the above embodiment, the airtight sealing material 24 is provided on the front surface of the flange portion 10 ′ of the chamber 10 and the electromagnetic wave sealing material 25 is provided on the outer side thereof. Conversely, the electromagnetic wave sealing material 25 is provided on the inner side and the airtight sealing material 24 is provided on the outer side. May be provided. Further, the sealing material is not limited to the chamber 10 side, and may be provided on the door 11 side, or one sealing material may be provided on the door 11 side and the other sealing material may be provided on the chamber 10 side. In short, a first seal material is provided between the chamber 10 and the door 11 so as to surround the front opening of the storage chamber 9, and a second seal material is provided outside the first seal material to provide a first seal. One of the material and the second sealing material is the airtight sealing material 24 and the other is the electromagnetic wave sealing material 25, and the elastic rebounding degree of the airtight sealing material 24 is made higher than the elastic repelling degree of the electromagnetic wave sealing material 25. Any configuration may be adopted as long as the atmospheric pressure applied to the door when the pressure in the chamber 9 is reduced is applied more strongly to the airtight sealing material 24 than to the electromagnetic wave sealing material 25.
[0050]
【The invention's effect】
As is clear from the above description, the vacuum microwave defroster of the present invention has the following effects.
According to the first aspect of the present invention, since the door is integrally formed of aluminum and the surface on the storage chamber side is a concave curved surface, the weight of the door can be reduced, thereby facilitating the opening and closing operation. In addition, since the storage chamber side has a concave curved surface even when the weight is reduced, it is possible to ensure sufficient strength to withstand the atmospheric pressure during decompression, and the conflicting elements of weight and strength can be achieved without hindrance.
[0051]
According to the second aspect of the present invention, since the concave curved surface is mirror-finished and the insulating film is formed, the microwave reflection efficiency can be improved and the heating of the wall surface by the microwave can be prevented. In addition, when an insulating film is formed, mechanical scratches and the like can be prevented, and discharge and electric corrosion caused by microwaves occurring in the portion in contact with the chamber can be prevented, and sufficient durability can be ensured even when used for business purposes. .
[0052]
According to the invention described in claim 3, since the concave curved surface formed on the inner surface of the door is formed with a curvature that reflects the microwave toward the turntable, the microwave is efficiently irradiated to the object to be thawed. be able to.
[Brief description of the drawings]
FIG. 1 is a front view showing an appearance of a vacuum microwave defroster according to an embodiment of the present invention.
FIG. 2 is a sectional view of a chamber and a door according to the present embodiment.
3A is a cross-sectional view of an airtight seal material and an electromagnetic wave seal material in a state in which the door is opened, and FIG. 3B is a cross-sectional view of the airtight seal material and the electromagnetic wave seal material before the door is closed and the inside of the chamber is decompressed. (C) is sectional drawing of the airtight sealing material and electromagnetic wave sealing material of the state which pressure-reduced the inside of a chamber.
FIG. 4 is a block diagram illustrating a connection between a control device and another device.
FIG. 5 is an explanatory diagram showing a thawing cycle in the vacuum microwave thawing machine of the present embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vacuum microwave thawing machine 2 Case 3 Food storage part 4 Machine storage part 5 Control part 6 Display part 7 Operation part 8 Caster 9 Storage room 10 Chamber 11 Door 12 Handle 13 Rotating shaft 14 Bearing 15 Turntable 16 Table drive motor 17 Concave surface 20 Straight waveguide 21 Reducer waveguide 22 Microwave generator (magnetron)
23 Flange connection portion 24 Airtight seal material 25 Electromagnetic wave seal material 26 First groove 27 Second groove 30 Discharge detection sensor 31 Vacuum pressure sensor 40 Atmospheric release valve 41 Pressure regulating valve 43 Pressure reducing system 44 Check valve 45 Pump drive motor 46 Vacuum pump 50 Control device 51 ROM
52 Table Drive Motor Power Supply Control System 53 Pump Drive Motor Power Supply Control System 54 Atmospheric Open Valve Open / Close Control System 55 Pressure Regulator Open / Close Control System 56 Microwave Generator Power Supply Control System 57 Detection Value Input System 58 for Discharge Detection Sensor Detection value input system 59 for the vacuum pressure sensor Input system 60 for setting values for the operation unit Display output system for the display unit

Claims (3)

A chamber having a door, a vacuum pump for depressurizing a storage chamber defined by the chamber and the door, a microwave generator for irradiating the storage chamber with microwaves, and a turntable provided in the chamber, In a vacuum microwave thawing machine that performs thawing by irradiating microwaves in a decompressed state in the storage chamber to heat the thawing object on the turntable,
A vacuum microwave thawing machine, wherein the door is integrally formed of aluminum and the surface on the storage chamber side is a concave curved surface.   The vacuum microwave defroster according to claim 1, wherein the concave curved surface is mirror-finished and an insulating film is formed.   The vacuum microwave defroster according to claim 2, wherein the concave curved surface has a curvature that reflects the microwave toward an object to be thawed on a turntable.

Images